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Mercury 40 FourStroke User Manual

Mercury 40 FourStroke
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IGNITION
Page 2A-12 90-857046R1 NOVEMBER 2001
Flywheel Assembly
The flywheel assembly contains six permanently charged magnet segments which are
bonded and retained to the inner wall of the flywheel. Each magnet contains a north and a
south pole providing a 12 pole system.
Ignition Coils
a
b
a-S/N OG960499 and Below
b-S/N OG960500 and Up
The primary (+) side of the ignition coil receives voltage discharged from a capacitor in the
ignition (CDI) circuit located inside the ECM. The voltage is multiplied by the coil until it can
jump the spark plug gap. Each ignition coil will produce a high voltage spark at each crank-
shaft revolution, producing a spark at each cylinder at the proper time (pre-determined by
the ECM). Ignition coil maximum output is approximately 40,000 volts.
Ignition Test Procedures
Direct Voltage Adapter (DVA)
WARNING
DANGER – HIGH VOLTAGE/SHOCK HAZARD! Do not touch ignition components
and/or metal test probes while engine is running and/or being “cranked”. STAY
CLEAR OF SPARK PLUG LEADS. To assure personal safety, each individual spark
plug lead should be grounded to engine.
WARNING
When testing or servicing the ignition system, high voltage is present. DO NOT
TOUCH OR DISCONNECT any ignition parts while engine is running, while key
switch is on or while battery cables are connected.
CAUTION
Failure to comply with the following items may result in damage to the ignition system.
1. DO NOT reverse battery cable connections. The battery negative cable is (-) ground.
2. DO NOT “spark” battery terminals with battery cable connections to check polarity.
3. DO NOT disconnect battery cables while engine is running.
4. DO NOT crank engine with CDI or Ignition Coils not grounded.

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Mercury 40 FourStroke Specifications

General IconGeneral
BrandMercury
Model40 FourStroke
CategoryOutboard Motor
LanguageEnglish

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